Barrett Heyneman <
heyneman@its.caltech.edu> wrote:
: I'm moving this over to the .usb group after this post.
:> use usbd_alloc() to allocate memory for your transfers and pass this
:> pointer for addr in the usbd_setup_vendor() calls.
: If the URB struct doesn't have a pointer to its associated memory, is there
: a better way to find which buffer is being used by an URB in the CBF from
: usbd_io() when given that URB? Right now we basically loop through the list
: of URBs until we find the one that the CBF is dealing with, then find the
: matching buffer based on the position in our array.
typedef struct _your_urb {
struct usbd_urb *urb;
_uint8 *baddr;
} your_urb_t;
your_urb_t urb_list[];
//allocate all urbs
curr_urb->urb = usbd_alloc_urb()
curr_urb->baddr = usbd_alloc()
usbd_setup_isochronous( curr_urb->urb, URB_DIR_IN | URB_ISOCH_ASAP, 0, curr_urb->baddr, ep_in_size );
if( status = usbd_io( curr_urb->urb, ep_in, your_isoch_cbf, curr_urb, USBD_TIME_INFINITY ) ) {
fprintf( stderr," Error on usbdi_io\n");
}
In the callback function you then get passed "curr_urb" from which you can get
the buffer address.
Henry
: Thanks,
: Barrett
: "Henry Van Dyke" <
henry@qnx.com> wrote in message
: news:bebsvh$s7d$
1@nntp.qnx.com...
:> Barrett Heyneman <
heyneman@its.caltech.edu> wrote:
:> : I've got a few questions about USB related issues for writing a camera
:> : driver
:>
:> : 1. According to the USB DDK there is a usbd_setup_control() function for
:> : setting up a URB for control transfers. I can't call it (not defined)
: and I
:> : don't see it in usbdi.h. Does anyone know where it is / if it exists at
: all?
:> : (I believe we're running QNX 6.1).
:>
:>
:> use usbd_setup_vendor() instead.
:>
:>
:> : 2. As far as I can tell, other UNIX OSs' URB structures have links to
: their
:> : associated memory buffers (in Linux I think it's urb.transfer_buffer or
:> : something similar). Does the URB structure in QNX have an equivalent
: that
:> : I've missed?
:>
:> use usbd_alloc() to allocate memory for your transfers and pass this
:> pointer for addr in the usbd_setup_vendor() calls.
:>
:>
:> : Additionally, if anyone who has decent experience with usb drivers in
: QNX
:> : and doesn't mind being bothered by someone who doesn't, like me
,
: would be
:> : willing to send me an email so I can ask some other specific questions,
: I'd
:> : appreciate it.
:>
:> : Thanks,
:> : Barrett
:>
:>